package com.atguigu.gulimall.cart.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.common.CartConstant;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.cart.feign.ProductFeignService;
import com.atguigu.gulimall.cart.interceptor.CartInterceptor;
import com.atguigu.gulimall.cart.service.CartService;
import com.atguigu.gulimall.cart.vo.Cart;
import com.atguigu.gulimall.cart.vo.CartItem;
import com.atguigu.gulimall.cart.vo.SkuInfoVo;
import com.atguigu.gulimall.cart.vo.UserInfoTo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.math.BigDecimal;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.stream.Collectors;

@Slf4j
@Service
public class CartServiceImpl implements CartService {

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    ThreadPoolExecutor executor;



    @Override
    public CartItem addToCart(Long skuId, Integer num) throws ExecutionException, InterruptedException {
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        String result = (String) cartOps.get(skuId.toString());

        if(StringUtils.isEmpty(result)){
            //2、添加新商品到购物车
            CartItem cartItem = new CartItem();
            //1.远程查询当前要添加的商品的信息
            CompletableFuture<Void> getSkuInfoTask = CompletableFuture.runAsync(() -> {
                R skuInfo = productFeignService.getSkuInfo(skuId);
                if (skuInfo.getCode() == 0) {
                    SkuInfoVo data = skuInfo.getData("skuInfo", new TypeReference<SkuInfoVo>() {
                    });
                    cartItem.setCheck(true);
                    cartItem.setCount(num);
                    cartItem.setImage(data.getSkuDefaultImg());
                    cartItem.setTitle(data.getSkuTitle());
                    cartItem.setSkuId(skuId);
                    cartItem.setPrice(data.getPrice());

                }
            },executor);
            //3、远和查询sku的组合信息
            CompletableFuture<Void> getSkuSaleAttrValues = CompletableFuture.runAsync(() -> {
                List<String> values = productFeignService.getSkuSaleAttrValues(skuId);
                cartItem.setSkuAttr(values);
            }, executor);
            CompletableFuture.allOf(getSkuInfoTask, getSkuSaleAttrValues).get();

            String s = JSON.toJSONString(cartItem);
            cartOps.put(skuId.toString(),s);
            return cartItem;
        }else {
            //购物车有此商品修改数量即可
            CartItem cartItem = JSON.parseObject(result, CartItem.class);
            cartItem.setCount(cartItem.getCount() + num);
            cartOps.put(skuId.toString(),JSON.toJSONString(cartItem));
            return cartItem;
        }
    }

    @Override
    public CartItem getCartItem(Long skuId) {
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        String  o = (String)cartOps.get(skuId.toString());
        CartItem cartItem = JSON.parseObject(o, CartItem.class);
        return cartItem;
    }

    @Override
    public Cart getCart() throws ExecutionException, InterruptedException {
        Cart cart = new Cart();
        UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        if(userInfoTo.getUserId() != null){
            //用户己登录
            String cartKey = CartConstant.CART_PREFIX + userInfoTo.getUserId();
            //BoundHashOperations<String, Object, Object> hashOps = redisTemplate.boundHashOps(cartKey);
            //如果临时购物车的数据还没合并，
            //  2）、临时购物车的key
            String temptCartKey = CartConstant.CART_PREFIX  + userInfoTo.getUserKey();
            List<CartItem> tempCartItems = getCartItems(CartConstant.CART_PREFIX + userInfoTo.getUserKey());
            if(tempCartItems != null && tempCartItems.size() > 0){
                //临时购物车的数据需要合并
                for (CartItem item : tempCartItems) {
                    addToCart(item.getSkuId(),item.getCount());
                }
                //清除临时购物车的数据
                clearCartInfo(temptCartKey);
            }
            //再来获取登录后的购物车数据(包含临时购物车的数据，和合并之前的登录后的购物车的数据)
            List<CartItem> cartItems = getCartItems(cartKey);
            cart.setItems(cartItems);
        }else {
            //用户没登录
            String cartKey = CartConstant.CART_PREFIX + userInfoTo.getUserKey();
            //获取临时购物车的所有购物项
            List<CartItem> cartItems = getCartItems(cartKey);
            cart.setItems(cartItems);
            cart.getTotalAmount();
        }
        return cart;
    }

    @Override
    public void checkItem(Long skuid, Integer check) {
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        CartItem cartItem = getCartItem(skuid);
        cartItem.setCheck(check == 1 ? true:false);
        String jsonString = JSON.toJSONString(cartItem);
        cartOps.put(skuid.toString(),jsonString);

    }

    @Override
    public void changeItemCount(Long skuid, Integer num) {
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        CartItem cartItem = getCartItem(skuid);
        cartItem.setCount(num);
        String jsonString = JSON.toJSONString(cartItem);
        cartOps.put(skuid.toString(),jsonString);
    }

    @Override
    public void deleteItem(Long skuid) {
        BoundHashOperations<String, Object, Object> cartOps = getCartOps();
        cartOps.delete(skuid.toString());
    }

    @Override
    public List<CartItem> getUserCartItems() {
        UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        if(userInfoTo.getUserId() == null){
            return null;
        }
        String cartKey = CartConstant.CART_PREFIX + userInfoTo.getUserId();
        List<CartItem> cartItems = getCartItems(cartKey);
        //所有被选中的购物项
//        List<CartItem> collect = cartItems.stream().filter((item) -> {
//            return item.getCheck();
//        }).collect(Collectors.toList());
        List<CartItem> collect = cartItems.stream()
                .filter(item->item.getCheck())
                .map((item)->{
                    //更新为最新价格
                    R price = productFeignService.getPrice(item.getSkuId());
                    String data = String.valueOf(price.get("data"));
                    item.setPrice(new BigDecimal(data));
                    return item;
                }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 获取到要操作的购物车
     * @return
     */
    private BoundHashOperations<String, Object, Object> getCartOps() {
        UserInfoTo userInfoTo = CartInterceptor.threadLocal.get();
        String cartKey = "";
        if(userInfoTo.getUserId() != null){
            //用户己登录
            cartKey = CartConstant.CART_PREFIX + userInfoTo.getUserId();
        }else {
            //用户没登录
            cartKey = CartConstant.CART_PREFIX + userInfoTo.getUserKey();
        }
        BoundHashOperations<String, Object, Object> operations = redisTemplate.boundHashOps(cartKey);
        return operations;
    }

    public void clearCartInfo(String cartKey) {
        redisTemplate.delete(cartKey);
    }

    public List<CartItem> getCartItems(String cartKey){
        BoundHashOperations<String, Object, Object> hashOps = redisTemplate.boundHashOps(cartKey);
        List<Object> values = hashOps.values();
        if (values != null && values.size() > 0){
            List<CartItem> collect = values.stream().map((obj) -> {
                String str = (String) obj;
                CartItem cartItem = JSON.parseObject(str, CartItem.class);
                return cartItem;
            }).collect(Collectors.toList());
            return collect;
        }
        return null;
    }
}
